4. Stocks to watch -- Yahoo, Intel: Monday is reportedly the deadline for any final bids to acquire Yahoo(YHOO). Investors may not hear much officially about the bids, but information could begin to leak out. And the company will release earnings on Tuesday afternoon.

Intel(INTC) is in the spotlight Monday after a report that it's planning to lay off thousands of employees as soon as Tuesday, when the company releases earnings.

5. Brazil's crisis deepens: President Dilma Rousseff is a step closer to being ousted after lawmakers in the lower house of parliament voted for her impeachment on Sunday.

The impeachment motion will next go to the country's Senate. If a majority approves it there, Rousseff will have to step down for 180 days to defend herself in a trial. The Brazilian currency is holding steady on Monday.

6. Weekly market recap: Strong gains in the middle of last week gave a big boost to all the main U.S. indexes.